What is Air grade E?

Grade E Air has become the global specification for quality of air required for diving. It is based on the standard CGA G-7 and CGA G-7.1. Grade E parameters are:

  • Carbon Dioxide:

    • In air at atmospheric pressure, you can breathe up to 10,000 ppm CO2, but the maximum allowable pressure is 1.000 ppm. Too much CO2 can cause symptoms of dizziness, nausea, and headaches. Additionally cause an increase in respiration rate.
    • The air of Meridian 87 contains less than 1000 ppm required.
  • Carbon Monoxide:

    • This gas is not colorless, tasteless, considered the most dangerous pollutant gases breathing. Cause headaches, dizziness, nausea, unconsciousness and even death.
    • Meridiano 87 air contains less than 1 ppm.
  • Oils:

    • Inhalation of oil from oil-lubricated compressors improperly maintained can cause inflammation of the lungs. Inhalation of these particles has been associated with respiratory, cardiac, infections and asthma attacks. These particles can also clog intake screens of the early stages of regulators, causing poor performance of the regulator and increases the effort of breathing.
    • Meridiano 87 works with a rigorous preventive maintenance plan to prevent failures and leaks in compressors. Additionally all the air is filtered online using various filters to remove most of these pollutants and odors some that may be present.
    • The standard for Grade E allows a maximum of 5 mg/cm3
    • Meridiano 87 air contains less than 1 mg/cm3
  • Moisture:

    • The gases used for SCUBA diving must be as dry as possible. Lowering the temperature to go, the ability to retain a gas steam is reduced. When the gas reaches its wet bulb temperature, water vapor begins to condense to water. Diving air must be dry enough to prevent equipment damage by internal condensation in the cylinder or the different regulators. Water within the cylinder may increase the corrosion and therefore shorten the life of the cylinders.
    • The standard for Grade E allows a maximum of 67 ppm @ -50 Degrees F
    • Meridiano 87 air contains less than 30 ppm @ -63 C
  • Hydrocarbons:

    • The hydrocarbons may interfere with the ability to take oxygen. Short-term exposure is associated with mucous membrane irritation, nausea, vomiting, diarrhea and confusion.
    • Thousands of different gases and vapors may potentially be present in the air. These can be manmade or natural. It is measured as a group described as "Total Hydrocarbon count" or THC
    • The Standard Grade E allows a maximum of 25 ppm.
    • The Air of Meridiano 87 contains less than 1 ppm.

Pollutant M87 Air Allowable (Grade E)
Carbon dioxide < 700 ppm 1000 ppm
Carbon Monoxide < 1 ppm 10 ppm
Total Hydrocarbons < 1 ppm 25 ppm
Water vapor < 28 ppm 67 ppm
Wet Bulb Temperature (F) -65 F -50 F
Oil mg/cm³ < 1 mg/cm³ 5 mg/cm³
Particles mg/m³ < 1 mg/m³ 5 mg/m³
Smell Not detectable Not detectable

Meet the last external review Meridiano 87 air doing click here
Meet the latest certificate of Meridiano 87 to the Air grade E doing click aquí